Why must medical gas cylinders be kept upright?

Medical gas cylinders must be kept upright primarily to prevent gas from escaping uncontrollably. When cylinders are upright, the pressure regulator and valves are designed to function correctly, ensuring that gas is released in a controlled manner. If gas cylinders are laid on their sides, there is a risk that liquid gas (in cases where the gas is stored as a liquid under pressure) could escape through the vaporization process, leading to uncontrolled gas release. This can pose safety risks such as fire hazards or oxygen enrichment in the environment, which can be dangerous to health.

Additionally, storing cylinders in an upright position helps to maintain stability, preventing them from falling over, which could also lead to damage or accidental release of gas. Proper storage is critical in ensuring the safety of personnel and the environment surrounding the gas tanks.